二氯菊酸2－甲基－3－（2－呋喃基）－2－丙烯酯的合成

报导了一种新拟除虫菊酯的设计和合成。标题化合物是由二氯菊酰氯与新自制的２－甲基－３－（２－呋喃基）－２－丙烯－１－醇酯化合成。     

二氯菊酸2—甲基—3—（2—呋喃基）—2—丙烯酯的合成

报导了一种新拟除虫菊酯的设计和合成，标题化合物是由二氯菊酰氯与新自制的２－甲基－３－（２－呋喃基）－２丙烯－１－醇酯化合成。     

拟除虫菊酯筛选及分子设计

综述了拟除虫菊酯的进展及新拟除虫菊酯的筛选和分子设计的方法等。参考文献５８篇。     

含嘧啶环的新拟除虫菊酯的合成及其生物活性的研究

拟除虫菊酯是一类高效、低毒、广谱性杀虫剂。嘧啶环是生物分子和医药中有较好活性的基团。本文拟在菊酯分子中引入嘧啶杂环,并测试其生物活性。我们以β-二酮为起始原料,分别与尿素、甲酰胺和脒缩合关环形成嘧啶,并进一步合成含嘧啶环的新拟除虫菊酯。所合成化合物的生物试验表明其中一些化合物对家蝇具有较好的击倒效应和杀虫效能。     

拟除虫菊酯学术讨论会在南京召开

江苏省化学化工学会和昆虫学会联合举办的拟除虫菊酯学术讨论会,于1979年3月18日至21日在南京召开。参加会议的有全国从事拟除虫菊酯研制工作的科研、教学、生产和行政等80多个单位,共100多位代表。拟除虫菊酯,是一类新型的高效、低毒、低残留杀虫剂。由于它杀虫效力强、治虫谱广、用药量少,对人畜无害又不污染环境等优点,所以被视为一类较理想的新农药,当前在国内外受到极大的重视。拟除虫菊酯在国际上发展很快。二氯苯醚菊酯,是拟除虫菊酯中第一个具有较高耐光性能、可用于防治农业害虫的新杀虫剂,1973年英国首先合成。以后,又相继出现了速灭菊酯(S-5602)、溴氰菊酯(Decis)等结构简单、特别高效的新拟除虫菊酯。对此,江苏省农药研究所副所长程暄生同志在会上作了“近代拟除虫菊酯杀虫剂的新进展”的报告,受到了与会者的好评。     

新型非酯型拟除虫菊酯类化合物的合成及其生物活性的研究(Ⅱ)

非酯型拟除虫菊酯杀虫剂是近年来菊酯类杀虫剂研究的新进展。这是传统拟除虫菊酯结构中的酯基被其它官能团如肟醚基、醚键、亚甲基、羰基等替代后的化合物。作者曾报道用酰胺基替代酯基合成非酯型酰胺类菊酯化合物,所得化合物对家蝇亦具有一定的杀     

新型非酯型拟除虫菊酯类化合物的合成及其生物活性的研究(Ⅰ)

传统的拟除虫菊酯类杀虫剂均含有1个酯基。近些年来,相继合成了一些非酯型拟除虫菊酯化合物。在保持分子整体空间结构不变的情况下,用其它功能团替换酯基,已开发出肟醚菊酯、醚菊酯、烃菊酯和酮菊酯等高效低毒、结构简化的杀虫剂,其中醚菊酯已正式作为农药商品。作为拟除虫菊酯类化合物结构变化的新尝试,我们合成了10种非酯型拟除虫菊酯新化合物,它们属于N-芳基-3-甲基-3-(对乙氧基苯基)丁酰胺类化合物,结构如下:     

含噻唑酮的拟除虫菊酯的合成

报道一类新型结构的拟除虫菊酯及类似物的合成。以2-噻唑啉(硫)酮及其衍生物代替拟除虫菊酯结构中的醇部分,对农药拟除虫菊酯的结构进行改良。经初步测试,新结构拟除虫菊酯具有杀虫活性。     

γ－芳基取代烯丙醇菊酯的合成及杀虫活性

γ－芳基取代烯丙醇菊酯的合成及杀虫活性陈亚娟，黄润秋，马军安（南开大学元素有机化学研究所，天津，３０００７１）关键词γ－芳基取代烯丙醇，拟除虫菊酯，杀虫活性第一个人工合成除虫菊酯烯丙菊酯保留了天然除虫菊酯醇部分的环戊烯醇酮结构，至今仍广泛用作卫生杀虫...     

青菜中二氯苯醚菊酯残留量的测定

二氯苯醚菊酯[2,2-二甲基-3-(2,2-二氯代乙烯墓)环丙酸-3-苯氧苄酯]是由Elliott等发展起来的新拟除虫菊酯,是一种高效低毒的新农药。药效试验表明,它对稻、棉、蔬、果的主要害虫,都有良好的防治效果。配合药效试验,我们测定了二氯苯醚菊酯在青菜中的残留量,观察其消失动态,以了解它在作物上的残留情况。     

Synthesis and Acaricidal Activity of Some New 1,2,4‐Triazine Derivatives

A new series of 1,2,4‐triazine derivatives were designed, synthesized, and identified on the basis of IR, ¹H‐NMR, ¹³C‐NMR, and EI‐MS spectral data. The potent acaricidal activity of 1,2,4‐triazine derivatives against eggs and adult female of Tetranychus urticae (Koch) was assessed compared with pyridaben under laboratory conditions. Structure acaricidal activity relationships of the promising 1,2,4‐triazine derivatives were analyzed for eggs and adult female; the nature and position of the substituents were important in demonstration of the activities.     

Unprecedented Quassinoids with Promising Biological Activity from Harrisonia perforata

Perforalactone A ( 1 ), a new 20S quassinoid with a unique cagelike 2,4‐dioxaadamantane ring system and a migrated side chain, was isolated from the plant Harrisonia perforata together with two biosynthetically related new quassinoids. The structures of these natural products were elucidated by NMR spectroscopy, X‐ray diffraction analysis, computational modeling, and the CD excitation chirality method. The compounds exhibited notable biological properties, including insecticidal activity against Aphis medicaginis Koch and antagonist activity at the nicotinic acetylcholine receptor of Drosophila melanogaster. The structural features of these compounds may be related to their promising biological characteristics. Their biosynthesis and an alternative origin of quassinoid‐type natural products are also discussed.     

Flavonoids of Crataegus microphylla

Crataegus microphylla C. Koch is one of the 17 species of Crataegus growing in Turkey [H.P.T. Ammon and R. Kaul (1994). Dtsch. Apoth. Ztg., 134, 2433, 2521, 2631.]. This report is part of a series on the chemical investigations of Crataegus species from Turkey. Nine flavonoids have been isolated from the leaves and flowers of C. microphylla C. Koch. The amounts of the flavonoids from the leaves and flowers of the plant were determined.     

Light-triggered release of insecticidally active spirotetramat-enol

Optical release of spirotetramat-enol was achieved by attaching coumarin photocage.     

Triterpene Glycosides of Tetrapanax papyriferum. IV. Acidic Glycosides from Stem Bark of T. Papyriferum

Twelve acidic triterpene glycosides of oleanolic acid, two of which were new, were isolated from stem bark of Tetrapanax papyriferum C. Koch (Araliaceae). The structures of these compounds were established using chemical methods and NMR spectroscopy.     

Geometric hydration shells for anionic platinum group metal chloro complexes

Solvation shells surrounding complex inorganic anions have not been extensively studied and are often mentioned with an amorphous picture in mind. We use a computational model previously validated against experimental results and ab initio quantum calculations (Lienke, A.; Klatt, G.; Robinson, D.; Koch, K. R.; Naidoo, K. J. Inorg.Chem. 2001, 40, 2352-2357) to investigate the nature of the hydration shells about simple platinum group metal chloro complexes ([PtCl(6)](2-), [RhCl(6)](3-), [PtCl(4)](2-), and [PdCl(4)](2-)). Our simulations show that the hydration shells surrounding these complexes are symmetric and take on familiar geometric forms. We find that only the [RhCl(6)](3-) complex has a clearly defined second hydration shell while the [PtCl(6)](2-), [PtCl(4)](2-), and [PdCl(4)](2-) second hydration shells are more diffuse.     

Nmr analysis of α-methyl branched organic acids

A methode for analyzing α-methyl branched organic acids has been developed using NMR spectroscopy. The composition is determined in terms of α,α-dimethyl, α-methyl-α-alkyl and α-methyl strnetures. Peak assignmunts were made on the basis of model compound studies. This technique has been successfully used in analyzing Koch acid synthesis mixtures.     

Vorsprung durch Chemie

The German Chemical Society (GDCh) and the Royal Society of Chemistry (RSC) have worked closely together for many years. David Giachardi, chief executive of the RSC, and Wolfram Koch, GDCh's chief executive, discuss the issues faced by the societies today.     

Phenolic acids in Peucedanum verticillare L. Koch ex Dc

JPC – Journal of Planar Chromatography – Modern TLC - Phenolic acids in the leaves, roots, and fruits of Peucedanum verticillare L. Koch ex Dc have been qualitatively determined for the...